<?php
$arr=[
    [1,2,3],
    [4,5,6],
    [7,8,9]
];
foreach($arr as $value){
   foreach($value as $value){
       echo $value;
   }
}
?>


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
</html>